作为附录，还列出了疏散标志的表示方法、图形文字尺寸、颜色、亮度、亮度比、可见度、视距等技术要求。
As an appendix, expression for escape sign, size of Graph and letter, colour, brightness, brightness contrast, visibility and apparent distance are also listed from technical requirements.
在此基础上，提出了基于多颜色空间的图像检索方法，奇异区域的像素点用YUV颜色空间表示，其他像素点用HSV颜色空间表示。
In order to solve this problem, an image retrieval method based on multiple color space was presented: the pixels in the singular regions were expressed by YUV and the others by HSV.
针对图像颜色的空间分布特征，提出了一种新的基于熵的表示方法。
According to the color spatial feature of an image, a new algorithm based on entropy is proposed.
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